<template>
	<view>
		<view class="search-box">
		  <uni-search-bar  @input="input"  :radius="18" cancelButton="none" ></uni-search-bar>
		</view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length!==0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">
          {{item.goods_name}}
        </view>
         <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17"  @click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
      
    </view>
    
    
	</view>
</template>

<script>
	export default {
		data() {
      
			return {
          timer:null,
          kw:'',
          //搜索的结果列表
          searchResults:[],
          //搜索历史的数组
          historyList:['1','2','3','4','5']
			};
		},
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      //input输入事件的处理函数
      input(e){
        clearTimeout(this.timer)
       this.timer=  setTimeout(()=>{
         this.kw=e.value
       this.getSearchResults()
       
       },500)
      },
        async  getSearchResults(){
        //判断关键词是否为空
        if(this.kw.length===0){
          this.searchResults=[]
          return 
        }
      const {data:res}=await  uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
      if(res.meta.status!==200) return uni.$showMsg()
      this.searchResults=res.message
      
      this.saveSearchHistory()
      },
      
      gotoDetail(item){
     
          uni.navigateTo({
            url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
          })
        
      },
      
      saveSearchHistory(){
        // this.historyList.unshift(this.kw)
        const set=new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList=Array.from(set)
        
        // 对搜索的历史数据进行持久化的存储
       
         uni.setStorageSync('kw', JSON.stringify(this.historyList))
        
      },
      
      
      clean(){
        this.historyList=[]
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query='+kw
        })
      }
      
     
    },
    computed: {
      historys() {
        // 注意：由于数组是引用类型，所以不要直接基于原数组调用 reverse 方法，以免修改原数组中元素的顺序
        // 而是应该新建一个内存无关的数组，再进行 reverse 反转
        return [...this.historyList].reverse()
      }
    }
 
	}
</script>

<style lang="scss">
  .search-box{
    position: sticky;
    top: 0;
    z-index: 999;
  }
  .sugg-list{
    padding: 0 5px;
    .sugg-item{
        display: flex;
        align-items: center;
        justify-content: space-between;
        font-size: 12px;
        padding :13px 0;
        border-bottom:1px solid #efefef ;
      .goods-name{
        // 文字不允许换行（单行文本）
        white-space: nowrap;
        // 溢出部分隐藏
        overflow: hidden;
        // 文本溢出后，使用 ... 代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
  
  .history-box{
    padding: 0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    .history-list{
      display: flex;
      flex-wrap: wrap;
      .uni-tag{
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }
  
</style>
